原文链接：https://blog.csdn.net/cike14/article/details/50649811

 

import cv2  import numpy as np  camera=cv2.VideoCapture(0)  firstframe=None  while True:      ret,frame = camera.read()      if not ret:          break      gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)      gray=cv2.GaussianBlur(gray,(21,21),0)      if firstframe is None:          firstframe=gray          continue            frameDelta = cv2.absdiff(firstframe,gray)      thresh = cv2.threshold(frameDelta, 25, 255, cv2.THRESH_BINARY)[1]      thresh = cv2.dilate(thresh, None, iterations=2)      # cnts= cv2.findContours(thresh.copy(),cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)            x,y,w,h=cv2.boundingRect(thresh)      frame=cv2.rectangle(frame,(x,y),(x+w,y+h),(0,0,255),2)      cv2.imshow("frame", frame)      cv2.imshow("Thresh", thresh)      cv2.imshow("frame2", frameDelta)      key = cv2.waitKey(1)&0xFF            if key == ord("q"):          break    camera.release()  cv2.destroyAllWindows()

效果图